A5034613098- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geological formations and processes
- Isotope Analysis in Ecology
- Marine and environmental studies
- Pleistocene-Era Hominins and Archaeology
- Aeolian processes and effects
- Archaeology and ancient environmental studies
- Cryospheric studies and observations
- Tree-ring climate responses
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Geomagnetism and Paleomagnetism Studies
- Climate variability and models
- Radioactivity and Radon Measurements
- Astro and Planetary Science
- Hydrology and Sediment Transport Processes
- Botany and Plant Ecology Studies
- Paleontology and Stratigraphy of Fossils
- Peatlands and Wetlands Ecology
Johannes Gutenberg University Mainz
2014-2024
ARC Centre of Excellence for Core to Crust Fluid Systems
2021
Macquarie University
2021
University of Arizona
2019
Institut de l'Information Scientifique et Technique
2019
Leibniz Institute for Applied Geophysics
2011
Nordic Laboratory for Luminescence Dating
2011
Aarhus University
2011
University of Bern
2007
University of Massachusetts Boston
2004
Planktonic oxygen isotope ratios off the Indus delta reveal climate changes with a multi‐centennial pacing during last 6 ka, most prominent change recorded at 4.2 ka BP. Opposing isotopic trends across northern Arabian Sea surface that time indicate reduction in river discharge and suggest later cycles also reflect variations total annual rainfall over south Asia. The event is coherent termination of urban Harappan civilization valley. Thus, drought may have initiated southeastward habitat...
Here we present a high‐resolution marine sediment record from the El Niño region off coast of Peru spanning last 20,000 years. Sea surface temperature, photosynthetic pigments, and lithic proxy for flood events on continent are used as paleo–El Niño–Southern Oscillation data. The onset stronger activity in started around 17,000 calibrated years before present, which is later than modeling experiments show but contemporaneous with Heinrich event 1. Maximum occurred during early late Holocene,...
The processes that shaped modern European mitochondrial DNA (mtDNA) variation remain unclear. initial peopling by Palaeolithic hunter-gatherers ~42,000 years ago and the immigration of Neolithic farmers into Europe ~8000 appear to have played important roles but do not explain present-day mtDNA diversity. We generated profiles 364 individuals from prehistoric cultures in Central perform a chronological study, spanning Early Bronze Age (5500 1550 calibrated before common era). used this...
Abstract The upper Holocene marine section from a kasten core taken the oxygen minimum zone off Karachi (Pakistan) at water depth 700 m contains continuously laminated sediments with sedimentation rate of 1.2 mm/yr and unique record monsoonal climatic variability covering past 5000 years. Our chronostratigraphy is based on varve counts verified by conventional AMS 14 C dating. Individual hemipelagic couplets are about 0.8–1.5 mm thick, light-colored terrigenous laminae (A) deposited mainly...
The major deglacial intensification of the southwest monsoon occurred at 11,450 ± 150 calendar years before present, synchronous with a climate transition as recorded in Greenland ice. An earlier event 16,000 present end Heinrich layer 1 Atlantic and parallels initial rise global atmospheric methane concentrations first abrupt changes Antarctic; thus, evolution monsoonal high-latitude climates show teleconnections but hemispheric asymmetries. Superimposed on events, shows high-frequency...
Abstract Accumulation rates of biogenic and lithogenic components were studied in 39 turbidite-free, well-dated sediment cores from the northern Indian Ocean to define proportions fluvial eolian input reconstruct Quaternary patterns coastal upwelling. The majority dust deposited western Arabian Sea during Holocene (about 100 × 10 6 t yr −1 ) is advected Arabia by northwesterly winds, which overlie low-level southwest monsoon. glacial increase flux 160 culminated Sea, most probably due (i)...
Here, we present a high resolution marine El Niño flood record from Peru. A period of extreme drought without strong flooding occurred A.D. 800–1250. Anomalous precipitation patterns characterized the entire Indo‐Pacific ENSO domain, with dry events in northern Arabian Sea and mid‐latitudes both Americas, coinciding wet periods Atlantic Cariaco Basin. The occurrence contemporaneous moisture anomalies other archives region highlights role strength global climate evolution during late Medieval...
The 14 C ages of planktonic foraminifers Globigerinoides sacculifer bracketing the Younger Dryas in a δ 18 O record ruber from laminated sediment core on Pakistani continental margin suggest that surface reservoir Arabian Sea were excess 1000 years during deglaciation. A least squares error fit detailed chronology to (atmospheric) tree ring gave variable early Holocene between 780 and 1120 years, well above prebomb value 640 years. Mid‐Holocene are less constrained but probably closer value....
Abstract. Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (DO) cycles and Heinrich events, have been extensively studied using ice core marine proxy records. However, there is a limited understanding of magnitude these temperature fluctuations in continental regions, questions remain about seasonal signal events. This study presents 60 000-year-long reconstruction based on branched glycerol dialkyl tetraethers (brGDGTs) extracted from lake...